Acquisitions (Details Textual) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Jul. 02, 2011	May 02, 2011	Mar. 28, 2011
Acquisitions (Textual) [Abstract]
Business Acquisition cash price consideration		$ 4,066	$ 10,500		$ 6,500
Percentage of common stock owned				51.00%
Cumulative amount required to accrete the initial carrying amount to the redemption value	4,798
Contribution made to acquire ownership percentage				49.00%
Net cash received by the company				38,224
Estimated redemption value of the put option	10,290
Difference of redemption value and fair value	0
Percentage of ownership interest by minority				49.00%
Percent of Interest in Joint Venture			20.00%
Put option Exercisable Expiration period	4 years
Nishikawa Rubber [Member]
Acquisitions (Textual) [Abstract]
Percent of Interest in Joint Venture			77.70%
Original Tachaplalerts and Marubeni Thailand [Member]
Acquisitions (Textual) [Abstract]
Percent of Interest in Joint Venture			2.30%
Corporate Joint Venture [Member]
Acquisitions (Textual) [Abstract]
Fair value of assets acquired				$ 33,000